Cir-uit-breaker



LA W. MUM/EY.

CIRCUIT BREAKEH.

APPLlcAnoN F1LED1uNE1e,1916.

1 ,329,469. e Peeeeted Feb. 1920.

dummlls LESTER W. MULVEY, 0F NEWBURYPORT, MASSACHUSETTS. i

ein.,1 UIT-BREAKER.

Specification of Letters Patent.

Patented Feb. s, 1920.

Application filed June 16,1916. Serial No. 104,055.

To all .ic/tom t may concern Be it known that I, LESTER lV. MULVEY, a citizen ot' the United States, residing at Newburyport, in the county of Essex, State of Massachusetts, have invented certain new and uset'ul Improvements-in Circuit-Breakers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in they art to which it appertains to make and use the same.

This invention relates to the class of circuit breakers, and pertains particularly to a device for controlling the aerial circuit in a Wireless system.

-The primary object ot this invention is to provide an automatic grounding device for Wireless instruments.

It is furthermore an object to provide an automatic circuit breaking device Whose normal position is such that it Will hold the receiving and sending sets of a wireless outfit in a ground circuit, but which may be actuated to connect the receiving and sending mechanism with the aerial, the circuit breaker' returning toits normal position automatically when released.

More particularly, it is an object of the invention to provide a spring controlled cle-.

vice which will vnormally hold a circuit breaker in such position :that the operating circuit of the Wireless /set is disconnected from the aerial and connected to a ground circuit, but which may be depressed orl otherwise actuated against the action of the spring to hold the operating mechanism in circuit With the aerial, the spring controlled device returning to normal position as soon as it is released.

lVith the above and other objects yin View, as will hereinafter appear, myV invention will now be fully set forth and described, reference being had to the accompanying drawing. -v

In said drawings Figure 1 is an elevation of one the circuit shifting device.

Fig. 2 is a perspective view ot a circuit reportion of versing device.

Figf isa diagrammatic view of the electrical circuits in which my invention is inserted. and

Fig. Llis a perspective vievv of a modified form of the invention.

ypair ot contact members 17 and 18.

Fig. 5 is an enlarged plan View of the main switch mechanism.

Reterriiig more particularly to said drawings 1 denotes a suitable base block upon which is mounted an oscillatory lever 2, `said lever 2 being mounted on an intermediate insulated pin 3. Upon one end of said lever 2 is mounted a cross head 4 of copper4 oi other material having'suitable electrical conductivity, said cross head 4 having its ends shaped to engage between the blades of the conductor terminals 5 and 6. The terminal 5 is connected to the Wireless receiving and sending apparatus while the terminal 6 is grounded. Connected to the contact strip et by a suitable flexible connector 7 is the leading in Wire of the vvireless. v

Mounted upon the opposite end of the lever 2 is a slightly curved i'od 8, said rod solenoids 9 and 10.- Said solenoids are car-l ried upon the base 1 and are positioned in opposite relation so that the ends of the iron bar 8 projects loosely into the solenoids and can be affected thereby when one or the other is energized. Also carried by the lever 2 and extending beyond the bar 8 is an arm 11 Whose upper end carries a contact block 12, `said block 12 being arcuate in shape and carrying a pair of spaced contact pieces 14 and 15. The block 12 rides upon the inner face of a fixed block 16 Which is mounted upon the base and supports a The members 14 and 17 and 15 and 18 are arranged for alternate contact. 1

In F ig. 2, 19 indicates a footpiece Which is pivoted at one end, the trunnions 20 carried by the foot-piece 19 being carried in brackets 21. Below the foot-piece 19 is secured a spring 22, which normally expands to hold the free end of the Jfoot-piece 19 in elevated position. Atv one side, the footpiece 19 has secured thereto an arcuate block 23 which ridesv over a correspondingly shaped block 24 which rises from a base plate 25 rigidly mounted adjacent the foot-piece 19. The block 23 is provided with a pair of contact plugs 26 and 27 which are adapted-to contact alternately lWith similar contact plugs 28 and 29 with which the block 24@ is provided. The contacts 28 and 29 are s )aced apart in such relation to the contact p ugs 2() and 27 that when the contacts Q7 and 25) are in electrical connection, the contoets 2G and 28 are out of electrical connection, and vice versa.

Referring to the diagram ot' Fig. 3, it will be noted that the contacts 5' and t3 are con neeted respectively to the. wireless set, and to the ground. The contact bar -l is eon nected to the aerial 3l). and is adapted, as it yis swung into contact with either ot' the contacts 5 and (5 to connect the aerial to the wireless set or the ground. A battery Ill has one side connected in parallel tothe contact plugs :Z8 and 29 ot' the block 2l. The. contact plugs 2G and 27 of the block 2H are connected respectively to the contacts 17 and le ot' the block 1G. the conductors being led onto the base 1 by the binding posts 32. 'lheopposite side. ot the battery is connected to the solenoids t) and l0. The solenoids Sl and 10 respectively are connected to the pieces 14 and 15.

Referring to the modification shown in Fig'. 4, the platform 33 represents the base upon which the operator`s chair is located, said platform 33 being mounted and supported in practically the same manner as described tor the foot-piece lt). Thus, when the operator occupies his place in trout ot' the wireless instruments, the aerial is cut into. the receiving circuit autonnitically by the operators weight when he takes his seat. Conversely. when the operator rises, the apparatus is restored to normal condition by having the. aerial set connected to the ground circuit. I l

In the operation otI my improved mechanism. the normal position of the. mechanism is. as hereinbefore stated that vin whieh the ground circuit is connected to the wireless set, the circuits being then arranged as shown in the diagrammatic view. When it.

is desired to eut in the aerial, and relieve the receiving and sending apparatus trom tho ground circuit, the l'oot pedal l2) is depressed against the action ot the spring' 21)., at which time the contacts 2G and 28 are. separated .and the contacts 27 and y2t) brought into electrical connection. This action sends the current from the battery through the plato `13 through the contact 1S and thus to the solenoid. which being thereby energized, draws theA bar a downwardly so as to lift the contact member t into connection with they terminal 5, so that the receiving set is connected to the aerial.

lVliat lwcclaim as my invention is:-

ln 'a wireless telegraph set the combination with a ground terminal` a receiving set. terminal and\a leading in`wire. ot' an oscil- :latory leveryli'-lying acomluctive head willi lwhich the leadiiig in wire is connected and which head'is movable upon oscillation ol* the lever to engage the receiving set and f ground contacts alternately,the lever havingr armatures projecting from opposite sides` a solenoidsurrounding each armature and underr the alternate energization ot which solenoids thelefver may be oscillated, a pair ot contacts carried by vthe lever and with which one-terminal ot' each solenoid is electrically 'connecttal respectively, a source ot' electricity with `one terminal ot' which the other terminal ot' each solenoid is electrically connected, spaced contacts disposed i'or engagement by the contacts ot thc lever, and a switch disposed to electrically counccll said spaced contacts alternately with the other tm'minal of the source oll electricity.

ln testimony whereot, l atfix my signature, in the presence ot' two witnesses. LESTER lV. MULVEY. lVitncsseS WUJJAM C. (luenen.` 'IIMornY S. HrmLicnY. 

